Analysis Summary
Notes:
- 1) No attempt has been made to eliminate the non-significant decimal places.
- 2) This batgrbproduct analysis is done using the HEASARC data.
- 3) This batgrbproduct analysis is using the flight position for the mask-weighting calculation.
======================================================================
BAT GRB EVENT DATA PROCESSING REPORT
Process Script Ver: batgrbproduct v2.46
Process Start Time: Mon Jan 13 22:07:58 EST 2014
Host Name: batevent1
Current Working Dir: /local/data/batevent/batevent_reproc/trigger455155
======================================================================
Trigger: 00455155 Segment: 000
BAT Trigger Time: 329412099.072 [s; MET]
Trigger Stop: 329412100.096 [s; MET]
UTC: 2011-06-10T15:21:32.029260 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 308.150900074669 Dec: 74.8229314124885 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 14.04
Image Trigger?: NO
Rate S/N Ratio: 28.0178514522438 [ if not an image trigger ]
Image S/N Ratio: 14.04
Analysis Position: [ source = BAT ]
RA: 308.150900074669 Dec: 74.8229314124885 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 308.211906438053 Dec: 74.824086032288 [deg; J2000]
{ 20h 32m 50.9s , +74d 49' 26.7" }
+/- 0.857945296977731 [arcmin] (estimated 90% radius based on SNR)
+/- 0.284175885147032 [arcmin] (formal 1-sigma fit error)
SNR: 37.8596066338322
Angular difference between the analysis and refined position is 0.960764 arcmin
Partial Coding Fraction: 0.7109375 [ including projection effects ]
Duration
T90: 49.4439999461174 +/- 6.06258690250995
Measured from: -5.14000004529953
to: 44.3039999008179 [s; relative to TRIGTIME]
T50: 29.9559999704361 +/- 1.06301453753783
Measured from: 5.61999994516373
to: 35.5759999155998 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 34.4239999651909
to: 35.4239999651909 [s; relative to TRIGTIME]
Total Fluence
Measured from: -11.0879999995232
to: 59.4039999842644 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 2.013232 2.897798 2.125328 0.604842
0.053626 0.056967 0.051092 0.041721 [error]
Peak 0.120686 0.178148 0.160918 0.051551
0.007502 0.008777 0.008169 0.006054 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 70.492 -11.088 59.404
T90 49.444 -5.140 44.304
T50 29.956 5.620 35.576
Peak 1.000 34.424 35.424
====== Spectral Analysis Summary =====================================
Model : spectral model: simple power-law (PL) and cutoff power-law (CPL)
Ph_index : photon index: E^{Ph_index}
Ph_90err : 90% error of the photon index
Epeak : Epeak in keV
Epeak_90err: 90% error of Epeak
Norm : normalization at 50 keV in both the PL model and CPL model
Nomr_90err : 90% error of the normalization
chi2 : Chi-Squared
dof : degree of freedo
=== Time-averaged spectral analysis ===
(Best model with acceptable fit: N/A)
Model Ph_index Ph_90err_low Ph_90err_hi Epeak Epeak_90err_low Epeak_90err_hi Norm Nomr_90err_low Norm_90err_hi chi2 dof
PL -1.486 -0.049 0.049 - - - 7.25e-03 -1.84e-04 1.84e-04 91.120 57
CPL -1.341 -0.164 0.198 246.714 -111.147 -246.714 8.46e-03 -1.31e-03 1.93e-03 89.440 56
=== 1-s peak spectral analysis ===
(Best model with acceptable fit: PL)
Model Ph_index Ph_90err_low Ph_90err_hi Epeak Epeak_90err_low Epeak_90err_hi Norm Nomr_90err_low Norm_90err_hi chi2 dof
PL -1.237 -0.092 0.092 - - - 3.36e-02 -1.74e-03 1.74e-03 44.520 57
CPL -1.157 -0.125 0.327 529.769 -529.769 -529.769 3.66e-02 -4.51e-03 1.48e-02 44.570 56
=== Fluence/Peak Flux Summary ===
Model Band1 Band2 Band3 Band4 Band5 Total
15-25 25-50 50-100 100-350 15-150 15-350 keV
Fluence PL 6.44e-07 1.19e-06 1.70e-06 5.14e-06 4.86e-06 8.68e-06 erg/cm2
90%_error_low -3.28e-08 -3.53e-08 -5.38e-08 -3.65e-07 -1.31e-07 -3.95e-07 erg/cm2
90%_error_hi 3.35e-08 3.52e-08 5.37e-08 3.84e-07 1.31e-07 4.10e-07 erg/cm2
Peak flux PL 1.07e+00 1.26e+00 1.07e+00 1.54e+00 3.96e+00 4.96e+00 ph/cm2/s
90%_error_low -1.05e-01 -7.59e-02 -6.63e-02 -1.95e-01 -2.10e-01 -2.71e-01 ph/cm2/s
90%_error_hi 1.08e-01 7.53e-02 6.59e-02 2.12e-01 2.10e-01 2.74e-01 ph/cm2/s
Fluence CPL 6.22e-07 1.20e-06 1.72e-06 4.20e-06 4.81e-06 7.75e-06 erg/cm2
90%_error_low -4.24e-08 -3.81e-08 -5.93e-08 -9.54e-07 -1.47e-07 -9.60e-07 erg/cm2
90%_error_hi 4.32e-08 3.83e-08 5.98e-08 8.45e-07 1.47e-07 8.56e-07 erg/cm2
Peak flux CPL 1.06e+00 1.27e+00 1.08e+00 1.55e+00 3.96e+00 4.87e+00 ph/cm2/s
90%_error_low -1.30e-01 -7.93e-02 -7.10e-02 -5.65e-01 -2.15e-01 -5.22e-01 ph/cm2/s
90%_error_hi 9.99e-02 8.31e-02 7.78e-02 1.14e-01 2.12e-01 3.33e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 308.2119 74.8241 0.0051 26.9831 -48.9506 2.5581725 37.860 TRIG_00455155 Foreground time interval of the image: -11.088 13.029 (delta_t = 24.117 [sec]) Background time interval of the image: -239.072 -11.088 (delta_t = 227.984 [sec])
Light Curves
Note: The mask-weighted lightcurves have units of either count/det or counts/sec/det, where a det is 0.4 x 0.4 = 0.16 sq cm.
Full-time range; 1 s binning
Other quick-look light curves:
Spectra
Notes:
- 1) The fitting includes the systematic errors.
- 2) When the burst includes telescope slew time periods, the fitting uses an average response file made from multiple 5-s response files through out the slew time plus single time preiod for the non-slew times, and weighted by the total counts in the corresponding time period using addrmf. An average response file is needed becuase a spectral fit using the pre-slew DRM will introduce some errors in both a spectral shape and a normalization if the PHA file contains a lot of the slew/post-slew time interval.
- 3) For fits to more complicated models (e.g. a power-law over a cutoff power-law), the BAT team has decided to require a chi-square improvement of more than 6 for each extra dof.
Time averaged spectrum fit using the average DRM
Power-law model
Time interval is from -11.088 sec. to 59.404 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.48592 ( -0.0486975 0.0486964 ) Norm@50keV : 7.25004E-03 ( -0.00018426 0.000184251 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 91.12 using 59 PHA bins. # Reduced chi-squared = 1.599 for 57 degrees of freedom # Null hypothesis probability = 2.748438e-03 Photon flux (15-150 keV) in 70.49 sec: 0.901726 ( -0.025285 0.025359 ) ph/cm2/s Energy fluence (15-150 keV) : 4.86012e-06 ( -1.31034e-07 1.31221e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -11.088 sec. to 59.404 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.34097 ( -0.164055 0.198077 ) Epeak [keV] : 246.714 ( -111.182 -246.749 ) Norm@50keV : 8.46223E-03 ( -0.00130531 0.00193406 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 89.44 using 59 PHA bins. # Reduced chi-squared = 1.597 for 56 degrees of freedom # Null hypothesis probability = 3.005789e-03 Photon flux (15-150 keV) in 70.49 sec: 0.892135 ( -0.028014 0.028109 ) ph/cm2/s Energy fluence (15-150 keV) : 4.80914e-06 ( -1.47297e-07 1.4659e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 34.424 sec. to 35.424 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.2368 ( -0.0918562 0.0920101 ) Norm@50keV : 3.35766E-02 ( -0.0017364 0.00173597 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 44.52 using 59 PHA bins. # Reduced chi-squared = 0.7810 for 57 degrees of freedom # Null hypothesis probability = 8.855883e-01 Photon flux (15-150 keV) in 1 sec: 3.96287 ( -0.20985 0.21009 ) ph/cm2/s Energy fluence (15-150 keV) : 3.37248e-07 ( -1.96264e-08 1.97288e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 34.424 sec. to 35.424 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.15701 ( -0.0928086 0.359212 ) Epeak [keV] : 529.769 ( -935.314 -935.314 ) Norm@50keV : 3.66299E-02 ( -0.00320795 0.0160621 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 44.57 using 59 PHA bins. # Reduced chi-squared = 0.7958 for 56 degrees of freedom # Null hypothesis probability = 8.643130e-01 Photon flux (15-150 keV) in 1 sec: 3.95521 ( -0.21535 0.21172 ) ph/cm2/s Energy fluence (15-150 keV) : 1.12024e-07 ( -1.80949e-08 1.71277e-08 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = N/A sec. Hardness ratio (energy fluence ratio) = N/A
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = N/A S(50-150 keV) = N/A
The dash-dotted line and the dashed line traces the fluences calculated from the Band function with Epeak = 15 and 150 keV, respectively. Both lines assume a canonical values of alpha = -1 and beta = -2.5.
Mask shadow pattern
IMX = 3.343658566502133E-01, IMY = 3.839754157925001E-01
Spacecraft aspect plot
Bright source in the pre-burst/pre-slew/post-slew images
Pre-burst image of 15-350 keV band
Time interval of the image: -239.072000 -11.088000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 254.3070 35.2923 47.5 22.4 95.5 -0.0622 -0.2 8.0 Her X-1 299.5972 35.2092 0.6 39.0 25.8 6.1688 18.6 0.6 Cyg X-1 308.1491 40.9499 1.8 39.3 11.8 1.9879 6.5 1.8 Cyg X-3 326.2601 38.1824 5.7 50.9 0.2 -1.0282 -2.1 9.3 Cyg X-2 237.4343 40.0315 2.6 19.7 134.9 0.9367 4.4 ------ UNKNOWN 208.8072 40.5639 2.6 31.8 178.4 1.0229 4.4 ------ UNKNOWN 296.9892 67.9050 3.2 22.7 -33.5 0.6592 3.5 ------ UNKNOWN 164.0602 40.5818 5.7 55.3 -145.2 3.1677 2.1 ------ UNKNOWN 6.1947 61.7445 3.2 50.5 -44.1 3.4901 3.6 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -11.088000 13.028590 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 254.5365 35.5049 7.2 22.2 94.9 -0.1259 -1.6 10.5 Her X-1 299.5843 35.0729 3.5 39.1 26.0 0.3542 3.3 7.7 Cyg X-1 308.1552 40.7979 6.1 39.4 12.0 0.1834 1.9 9.5 Cyg X-3 326.1096 38.2343 18.3 50.8 0.3 -0.0996 -0.6 6.0 Cyg X-2 266.4364 36.5644 2.1 23.3 69.9 0.4359 5.6 ------ UNKNOWN 327.6130 33.4085 2.6 55.2 3.0 1.3007 4.4 ------ UNKNOWN 188.7234 24.6088 2.4 54.8 -177.1 0.9534 4.7 ------ UNKNOWN 308.2119 74.8241 0.3 27.0 -49.0 2.5582 37.9 ------ UNKNOWN 178.0394 42.3576 2.3 46.9 -153.6 0.6131 5.1 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 61.028600 963.059500 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 299.5749 35.1955 0.8 39.8 55.1 28.9901 15.1 0.8 Cyg X-1 308.1211 40.9673 2.7 33.8 44.2 4.5413 4.2 1.0 Cyg X-3 326.3748 38.3023 4.6 37.5 20.4 2.1718 2.5 9.6 Cyg X-2 250.8405 47.4322 3.6 36.2 118.5 4.9678 3.2 ------ UNKNOWN 245.7676 47.5954 3.2 37.4 123.9 5.8919 3.5 ------ UNKNOWN 181.6213 46.1575 3.2 54.0 -179.3 7.7871 3.6 ------ UNKNOWN 61.6713 73.5495 3.5 26.4 -100.0 2.5678 3.3 ------ UNKNOWN 140.0357 49.6216 5.6 55.3 -145.1 10.5139 2.2 ------ UNKNOWN 139.6793 49.7581 9.8 55.2 -144.9 6.5537 1.4 ------ UNKNOWN 27.4165 39.8278 2.7 49.0 -48.1 13.6674 4.2 ------ UNKNOWN